JP3693132B2 - Drain hole structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drainage hole structure, and more particularly to a drainage hole structure for a vehicle component.
[0002]
[Prior art]
Conventionally, as disclosed in Japanese Utility Model Publication No. 64-34854 as a drainage hole structure for vehicle parts, rainwater that has entered the space of the vehicle parts is prevented from entering the interior of the electrical system parts. Therefore, a structure having an opening hole such as a drain hole or a breathing hole communicating with the outside air is provided in the vehicle component.
[0003]
[Problems to be solved by the invention]
In the conventional drainage hole structure as described above, when high-pressure washing is performed on vehicle parts during maintenance, if high-pressure water is applied to both the drainage hole and the breathing hole at the same time, the electrical system There is a risk of water entering the inside of the part. At this time, there is a problem in that malfunction of electrical system components may occur.
[0004]
In order to prevent water from entering the interior of the electrical system component, it is also conceivable to provide a seal component between the electrical system component and the part that comes into contact with outside air. However, in this case, at least the increase in the number of parts constituting the seal part causes an increase in the number of parts, and the assembly work becomes complicated.
The present invention has been made to solve such problems, and an object of the present invention is to provide a drainage structure that prevents water from entering from the outside with a simple configuration.
[0005]
Another object of the present invention is to provide a breathing hole structure for a vehicle component that prevents the entry of water from the outside with a simple configuration without increasing the number of components.
[0006]
[Means for Solving the Problems]
According to the drain hole structure of the first aspect of the present invention, the first outer hole is disposed below the gravity direction, and the second outer hole is disposed above the first outer hole. It is hard to get caught in the two outer holes. Therefore, the high pressure water that has entered from one outer hole is discharged from the other outer hole due to the difference in how the high pressure water hits the two outer holes. Further, since the two outer holes are more likely to be ventilated than going from the outer hole to the inner hole, the high-pressure water that has entered from one outer hole is more likely to escape to the other outer hole than to reach the inner hole. Further, in a normal state, the water that has entered the inner space is discharged from the first outer hole through the communication path from the inner hole, with the second outer hole serving as a breathing hole.
In addition, since the inner hole and the two outer holes have a common maze structure, the high-pressure water that has entered from one outer hole is discharged to the outside through the communication passage and from the other outer hole to the inner hole. Is harder to penetrate.
Furthermore, since the intrusion of water from the outside is prevented by utilizing the negative pressure state of one outer hole, the configuration is simple. Therefore, assembly and maintenance of parts are simple.
[0007]
According to the drain hole structure of the second aspect of the present invention, when the throttle body and the throttle opening detector receive high-pressure water injection, the water that has entered from one outer hole is discharged to the outside from the other outer hole. Is done. Therefore, it is possible to prevent water from entering the inside of the throttle opening detector from the inner hole and causing malfunction of the throttle opening detector.
[0008]
According to the drainage hole structure of the third aspect of the present invention, since only a part of the inner wall surface of the throttle body is cut off, the water from the outside can be obtained with a simple configuration without increasing the number of parts. Prevent the intrusion. Therefore, assembly and maintenance of parts are simple.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, examples showing embodiments of the present invention will be described with reference to the drawings.
One embodiment in which the drain hole structure of the present invention is applied to a throttle device is shown in FIGS.
The throttle device shown in FIG. 3 rotatably supports the throttle shaft 7 via a bearing 17 on a throttle body 20 that forms part of an intake passage of an engine (not shown). The throttle shaft 7 blocks the intake passage 8 of the throttle body 20 from outside air by a rubber and metal seal portion 9. The rotor 11 of the throttle opening detector 6 is fitted into a throttle opening detector driving lever 7 a provided at one end of the throttle shaft 7 via a washer 14.
[0010]
The rotor 11 rotates according to the opening degree of the throttle shaft 7. The throttle opening detector 6 converts the throttle opening into an electric signal by making the electric resistance value of the potentiometer variable in conjunction with the rotor 11. A guide portion 13 is formed integrally with the housing 12 of the throttle opening detector 6. The housing 12 of the throttle opening detector 6 is attached to an attachment cylinder portion 20 a of the throttle body 20. At the time of assembly, the housing 12 is fixed to the throttle body 20 by inserting and tightening a bolt into the screw hole 10.
[0011]
As shown in FIGS. 1 and 2, a part of the arc of the inner wall surface 20b of the mounting cylinder portion 20a is cut in a concave shape in the radial direction from the lower end in the gravitational direction, A second passage 2 above is formed. A first outer hole 3 communicating with the outside air is provided between the first passage 1 and the second passage 2. Further, a second outer hole 4 communicating with outside air and having a larger opening diameter than the first outer hole 3 is provided at the upper end in the gravity direction of the second passage 2. An inner hole 5 communicating with an inner space 16 formed between the throttle body 20 and the housing 12 is provided at the lower end in the gravity direction of the first passage 1. The first outer hole 3 and the second outer hole 4 communicate with each other in the radial direction of the inner wall surface 20 b in the second passage 2. However, the first outer hole 3 and the inner hole 5 have a so-called maze structure in which the first passage 1 bends and communicates with the radial direction of the inner wall surface 20b at a right angle in the axial direction. Further, a gap 15 is formed between the inner wall surface 20b and the guide portion outer surface 13a that is substantially the same as or smaller than the opening diameter of the inner hole 5.
[0012]
Next, the effect of the drain hole structure of the present embodiment will be described.
In the case of high-pressure washing during engine maintenance, high-pressure washing water is reflected on an intake manifold (not shown) provided below the throttle body 20, and the high-pressure water is directed toward the first outer hole 3. The high-pressure water enters from the first outer hole 3 and collides with the guide portion outer surface 13a. At this time, the vicinity of the second outer hole 4 is in a negative pressure state due to a jet due to the high-pressure water flowing along the outer peripheral surface 12a of the housing 12 of the throttle opening detector 6. The first outer hole 3 and the inner hole 5 have a labyrinth structure that bends at right angles in the axial direction with the radial direction of the inner wall surface 20b in the first passage 1, and the opening diameter of the second outer hole 4 is the first. It is larger than the outer hole 3. Therefore, the water that has collided with the outer surface 13a of the guide part is in a state that it is easier to go to the second outer hole 3 through the second passage 2 than to the inner hole 1 through the first passage 1, and from the second outer hole 3 Discharged.
[0013]
In a normal use state, water such as rainwater that has entered the inner space 16 is discharged from the inner hole 5 through the first passage 1 to the outside through the first outer hole 3. At this time, the second outer hole 4 becomes an air inlet for draining without delay from the first outer hole 3, that is, a breathing hole.
In the present embodiment, a gap 15 is formed between the inner wall surface 20b and the guide portion outer surface 13a. In the prior art, in the case of high-pressure washing during engine maintenance, if such a gap is formed, there is a high possibility that water will enter the throttle opening detector, and if water enters, the throttle opening will be detected. Malfunction may occur. However, in this embodiment, due to the negative pressure state by the jet in the vicinity of the second outer hole 4 and the labyrinth structure of the first outer hole 3 and the inner hole 5, high-pressure water that has entered from the first outer hole 3 It is discharged from the second outer hole 4 without entering the hole 5.
[0014]
In this embodiment, the drain hole structure of the present invention is applied to the throttle device, but it goes without saying that it can be applied to many devices having electric system parts such as a motor and a detector.
[Brief description of the drawings]
FIG. 1 is an end view of a mounting cylinder part of an embodiment in which a water draining structure of the present invention is applied to a throttle device.
FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a partially cutaway sectional view of the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st channel | path 2 2nd channel | path 3 1st outer side hole 4 2nd outer side hole 5 Inner hole 6 Throttle opening degree detector 7 Throttle shaft 7a Throttle opening degree detector drive lever 12 Housing 12a Housing outer peripheral surface 13 Guide part 13a Guide External surface 20 Throttle body 20a Mounting cylinder 20b Inner wall surface

Claims (3)

A container that partitions and forms a predetermined space; and a passage that is formed in the container and that communicates the space inside and the outside air.
The passage includes an inner hole communicating with a space formed in the container at a lower end in the gravity direction, a first outer hole located below the gravity direction and communicating with the outside air, and the first outer hole with respect to the gravity direction. A second outer hole disposed above and communicating with outside air;
From one of the outer holes being vented to the other of the outer holes, have a structure that overrides the vented to the inner bore from the first outer bore or said second outer bore,
The inner hole, the first outer hole and the second outer hole have a common maze structure;
The structure in which the ventilation from the one outer hole to the other outer hole has priority over the ventilation from the first outer hole or the second outer hole to the inner hole is due to an external negative pressure factor. Drainage hole structure characterized by that. The labyrinth structure is formed between a throttle body that forms part of an intake passage of an internal combustion engine and a throttle opening detector that detects the opening of a throttle valve that opens and closes the intake passage. The drain hole structure according to claim 1 . The drain hole structure according to claim 2 , wherein the maze structure is formed by cutting a part of an arc of the inner wall surface of the throttle body into a concave shape.

Images